Overview
The LMC555CMX/NOPB is a CMOS version of the industry-standard 555 series general-purpose timers, produced by Texas Instruments. This device is designed to offer the same capability of generating accurate time delays and frequencies as the LM555, but with significantly lower power dissipation and supply current spikes. The LMC555 is available in various packages, including the SOIC, VSSOP, PDIP, and the industry's smallest 8-bump DSBGA package. This component is particularly useful for applications requiring low power consumption and high precision timing.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Operating Temperature | -40 | 125 (LMC555IM), 85 (LMC555CM, MM, N, TP) | °C | |
| Supply Voltage | 1.5 | 5 | V | |
| Power Dissipation at 25°C | < 1 mW (at 5V), < 0.2 mW (at 1.5V) | mW | ||
| Astable Frequency | 3 MHz | |||
| Output Current | -10 mA | 50 mA | mA | |
| Package Size (SOIC) | 4.9mm × 6mm | mm | ||
| Package Size (VSSOP) | 3mm × 4.9mm | mm | ||
| Package Size (PDIP) | 9.81mm × 9.43mm | mm | ||
| Package Size (DSBGA) | 1.43mm × 1.41mm | mm |
Key Features
- Fast astable frequency of up to 3 MHz
- Available in industry's smallest 8-bump DSBGA package (1.43mm × 1.41mm)
- Low power dissipation: less than 1 mW at 5V supply and less than 0.2 mW at 1.5V supply
- Output fully compatible with TTL and CMOS logic at 5V supply
- Tested to -10 mA, 50 mA output current levels
- Reduced supply current spikes during output transitions
- Extremely low reset, trigger, and threshold currents
- Excellent temperature stability
- Pin-for-pin compatible with 555 series of timers
Applications
- Precision timing
- Pulse generation
- Sequential timing
- Time delay generation
- Pulse width modulation
- Pulse position modulation
- Linear ramp generators
Q & A
- What is the maximum operating temperature for the LMC555CMX/NOPB?
The maximum operating temperature for the LMC555CMX/NOPB is 125°C for the LMC555IM and 85°C for the LMC555CM, MM, N, TP models.
- What is the typical power dissipation of the LMC555 at 5V supply voltage?
The typical power dissipation of the LMC555 at 5V supply voltage is less than 1 mW.
- What is the maximum astable frequency of the LMC555?
The maximum astable frequency of the LMC555 is up to 3 MHz.
- Is the LMC555 compatible with TTL and CMOS logic?
Yes, the output of the LMC555 is fully compatible with TTL and CMOS logic at a 5V supply.
- What are the available package types for the LMC555?
The LMC555 is available in SOIC, VSSOP, PDIP, and 8-bump DSBGA packages.
- How is the time delay controlled in monostable mode?
In monostable mode, the time delay is precisely controlled by a single external resistor and capacitor.
- Can the LMC555 operate in both astable and monostable modes?
Yes, the LMC555 can operate in both astable and monostable modes depending on the application requirements.
- What is the significance of the DSBGA package for the LMC555?
The DSBGA package is the industry's smallest, making it ideal for space-constrained applications.
- How does the LMC555 reduce power consumption?
The LMC555 reduces power consumption through lower supply current spikes during output transitions and extremely low reset, trigger, and threshold currents.
- Is the LMC555 pin-for-pin compatible with other 555 series timers?
Yes, the LMC555 is pin-for-pin compatible with the 555 series of timers (NE555/SE555/LM555).
